admob on android studio not working

Question

我輸入下面的代碼，並通過連接到我的手機並啓用USB調試來測試它，我也生成一個已簽名的apk並且它仍然不工作，請幫助我，我只是新的在android工作室和編寫android應用程序。

在string.xml這不是我真正的廣告單元ID，我刪一些數字

MainActivity.java

package funaisraeljumbo.myapplication; 

import android.content.Intent; 
import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import com.google.android.gms.ads.AdRequest; 
import com.google.android.gms.ads.AdView; 



public class MainActivity extends ActionBarActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    AdView mAdView = (AdView) findViewById(R.id.adView); 
    AdRequest adRequest = new AdRequest.Builder().build(); 
    mAdView.loadAd(adRequest); 
} 
public void onClick(View v){ 

    switch (v.getId()){ 
     case R.id.button3: 
     Intent intent = new Intent(getBaseContext(), BasicDifferentiation.class); 
     startActivity(intent); 
     break; 
    } 

} 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
       return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
} 

activity_main.xml中

<TextView android:text="@string/hello_world" android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textStyle="bold" 
    android:textSize="20dp" 
    android:id="@+id/textView" 
    android:layout_marginTop="10dp" 
    android:layout_marginBottom="30dp"/> 

<LinearLayout 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" 
    android:id="@+id/linearLayout" 
    android:gravity="center" 
    android:layout_above="@+id/adView"> 


    <Button 
     android:layout_width="160dp" 
     android:layout_height="wrap_content" 
     android:text="@string/rules_for_differentiation" 
     android:id="@+id/button3" 
     android:onClick="onClick" /> 

    <Button 
     android:layout_width="160dp" 
     android:layout_height="wrap_content" 
     android:text="@string/trigonometric_function" 
     android:id="@+id/button" 
     android:onClick="onClick" /> 

    <Button 
     android:layout_width="160dp" 
     android:layout_height="wrap_content" 
     android:text="@string/log_and_expo" 
     android:id="@+id/button2" 
     android:onClick="onClick" 
     android:layout_marginBottom="20dp"/> 


</LinearLayout> 

<com.google.android.gms.ads.AdView 
    android:id="@+id/adView" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    ads:adSize="BANNER" 
    ads:adUnitId="@string/home"> 
</com.google.android.gms.ads.AdView> 

</LinearLayout> 

的build.gradle

apply plugin: 'com.android.application' 

android { 
    compileSdkVersion 21 
    buildToolsVersion "22.0.1" 

    defaultConfig { 
     applicationId "funaisraeljumbo.myapplication" 
     minSdkVersion 16 
     targetSdkVersion 21 
     versionCode 1 
     versionName "1.0" 
    } 
    buildTypes { 
     release { 
      minifyEnabled false 
      proguardFiles getDefaultProguardFile('proguard-android.txt'),  ' proguard-rules.pro' 
     } 
    } 
} 

dependencies { 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
    compile 'com.android.support:appcompat-v7:22.2.0' 
    compile 'com.google.android.gms:play-services-ads:7.8.0' 

AndroidManifest.xml中

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="funaisraeljumbo.myapplication" > 


    <uses-permission android:name="android.permission.INTERNET"/> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 

     <meta-data android:name="com.google.gms.version" 
      android:value="@integer/google_play_services_version"/> 

     <activity 
      android:name=".MainActivity" 
      android:label="@string/app_name" 
      android:screenOrientation="portrait"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity 
      android:name=".BasicDifferentiation" 
      android:label="@string/title_activity_basic_differentiation" > 
     </activity> 
     <activity android:name="com.google.android.gms.ads.AdActivity" 
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" 
      android:theme="@android:style/Theme.Translucent"/> 

    </application> 

</manifest> 

string.xml

<resources> 
    <string name="app_name">Differential Calculus Formula (Beta)</string> 

    <string name="hello_world">Differential Calculus Formula</string> 
    <string name="action_settings">Settings</string> 
    <string name="rules_for_differentiation">Rules For Differentiation</string> 
    <string name="trigonometric_function">Differentiation of Trigonometric Function</string> 
    <string name="log_and_expo">Differentiation of Logarithmic and Exponential Function</string> 
    <string name="title_activity_basic_differentiation">Basic Differentiation</string> 
    <string name="home">ca-app-pub-1x104x92x9x2x52x/272xx4x6x2</string> 
</resources> 

Answer 1

打開SDK管理器和安裝谷歌播放服務。

那麼這行添加到搖籃（模塊）

compile 'com.google.android.gms:play-services:9.4.0'